Fuel-pump of internal-combustion engines.



F. EDHOLM.

FUEL PUMP OF INTERNAL COMBUSTION ENGINES.

APPLICATIPN FILED FEB. 14. 1917.

1,222,270. Paten'fed A B-1011917.-

1 '0 all whom it may concern Be it known that I, Fnnoinc Ennomr, acitizen of the Kingdom of Sweden, residing at Eskilstuna, Sweden, haveinvented new 1 and useful Improvements in Fuel-Pumps ofIntel-11al-Combnstion Engines, of which the following is asrwcitic-ation.

This invention relates to fuel pumps ofv internal combustion engines andmore sper cially to the mechanism regulating the movements of suchpumps, which are operated by means of a rotating cam disk or the like.

In most of the regulating mechanisms of said type the cam disk isactuated directly by a centrifugal governor which varies the length ofthe pump stroke. This construction is connected with the serious incovenience that the pump pressure counteracts. to a great extent, theadjusting operation of the .governor llvballs, which, on accountthereof. are caused, during the rotation. to make violent oscillatingmovements which will cause a rapid wear and tear of the governor. Thesaid oscillating movements are rather 'large, even during normal runningof the engine, and will be highly increased, if the spraying nozzle bepartially blocked up by deposits from the fuel.

- The object of this invention is to obviate too great extent saidinconvcnicnm-s. this purpose the cam disk or the like actuating the pumpplunger is provided with a member movable in radial or approximatelyradial direction or rotatable conccntricall v to the cam disk, thetemporanv position of said member being detern'iined by the gover-nor.'Sajid member scrvcstto control the movements of the pump plunger duringthe. suction stroke of the pump and. conse- 4oplcntly. to regulate thequantity of the. fuel drawn in. The disk itself is inde ln-mlcnt oi--Zthegovernor, which consequent y. cannot v be, influenced by theresistance acting on the .f-pu i'ip 'rlunger during the delivery stroke.,45' 'p1eferreil embodiment of the invention is illustrated in theaccompanying drawing.

- inswliichz Figure l is a longitudinal axial section q through thecasing of the regulating mech- 0 auisin. certain parts of the mechanismbeing iewed from the side and other parts in sectioln Fig. 2 is acentral cross-section through the casing showing certain parts insection on the broken line .\'-B in Fig. 1.

Referring to the drawing, 1 is the fuel pump casing and 2 is thepumpplunger.

Specification of Letters Patent.

UNITED STATES ENT OFFICE.

FBEDRIC EDI-IOLM, OF ESKILSTUNA, SWED EN.

FUEL-PUMP OF INTERNAL-COMBUSTION ENUINES.

Pa tented Apr. 1o, 1917.

Application flied February 14, 1917. Serial No. 148M.

'lhe outer end of thepump plunger is formed as a fork 2 serving asbearing for a roller Inserted between the fork 20 and the pump casing 1is. spring 11 tending to more the plunger in the direction from the-pump casing. 4 1:; a continuously rotating shaft driven in any mannerfrom the crank shaft of the engine. Splined to the shaft 4 is a circulardisk 5, which is provided with a flattening 2i and close to saidflattening is a curved. llat men her 6 i 7 fixed in the (liSi he side 22of the member (3 direetetl from the shaft 4 is formed as an are havingthe same radius as the disk 5, while the side 23 of the member iournaled on a pin f t3 directed toward the shaft 4 is formed as an arceccentric to the are 22. The membr o is so located that its side extendsbeyond the flattening 21 and may, in its utmost posi tion. cover the m1space of the/member 5 formed by the flattening 21, as is shown by dottedlilies in Fig". 2.

The member 6 1;, by means of a spring 8, kept in close contact with awedge 9 con nectcd with a ring 23', which is movablea-xially on theshait 4 by means of a doublearmed lever 2% connected with a centrifugalgovernor 10.

The mechanism described operates as follows, it being supposed that theshaft 4 r0 tates in the direct on indicated by the arrow in Fig. .2.During the rotation of the shaft 4 the roller 3 is by the spring 11 keptin com tact with the disl: 5. until the roller at the point 11 comes in(ontact with the member 6, the position of which in relation to the pumpplunger 2 depend; upon the position of the wedge J in the longitudinaldirection of the shaft 4, said latte r position in turn depending uponthe dellection of the centrifugal governor 10. 'Ihaplunger 2 is. onaccount thereof, moved outward by the spring 11 a greater ocsmallerdistance according to the position of. the member '(3. andduring thismovement the s iction stroke is effected. \Vhcn the roller 3 is incontact with the points I: and as uidicatcd by dotted linesin Fig. 2.and. consequently. touches the flattening il the deliv ry strokecommences and.

-fly-balls of the governor sure however, being very small and, thereofpreventing the from being exactly Durfore, not being capable adjustedbetween the suction strokes.

; ing' the suction'stroke the governor is, in ad dition, acted upon bythe pressure caused by the spring 11, 'l.his pressure is, however,constant and may be reduced tina comparatively small value and willtherefore also exert a very insignificant inlluenee on the movements ofthe governor.

Instead of the vmember (3 shown in the drawin a member rotatableconcentrically to the isk 5 may be used, as for instance a memberprovided with a flattened portion and rotatable around the shaft 4-,such memher being adjusted in relation to the disk 5 by the centrifugalgovernor.

Having now particularly described and ascertained the nature of my saidinvention a nd in what manner the same is to be per formed, I'declarethat what I claim is:

1.:-:In an internal combustion engine, a fuel pump regulatingmechanism,comprising a rotating 'member effecting the delivery strokesof the fuel pump, a. member adjmstably attached to said rotating memberand controlling the suction strokes of the fuel pump, and a governorcontrolling the position of the latter member in relation to the saidrotating member.

2. In an internal combustirm engine, a fuel pump regulating mechanismcomprising a rotating cam disk having a flattened portion and effectingthe delivery strokes of the pump, a member adjustably journaled to saidcam disk and controlling the length of the suction strokes of the pump,and a con trifugal. governor controlling the. position of said member inrelation to the flattened portion of the cam disk.

3. In an internal combustion engine. a Fool pump regulatin mechanism,comprising a rotating cam disk effecting the delivery strokes of thepump, a curveshapod lnolubol journaled to said cam disk and rontrolliugthe length of the suction strokes of the pump, a governor, and. awedge-formed member operated by the governor and adjusting saidcurve-shaped member in relation to the rotating cam disk.

In testimony whereof I have signed my name.

FREDRIU EDI lOLM.

